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I work at a Ford dealership at the back counter parts department. We have seen this issue a few times. Mostly it deals with cheap or old tires. We have seen cheap tires do this right from the factory. The cords can start to separate, and cause all sorts of fun issues that are hidden. Such as balancing the tire on a regular balancer and have it come out perfect every time. But then get the vehicle up to speed and you get vibrations.
Good tires can do it as well, but it is usually due to some kind of trauma to the tire. Like a really bad pot hole.
My suggestion.... if you can.... is borrow a set of wheels and tires. See if the problem goes away.
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